Cttt-off valve hoe



To all whom it may concern Be it known that I, THOMAS ROGERS, of Paterson, in the county of Passaic, in the State of New `Jersey, have invented an Imlprovemernt `on Horatio Allens Cut-Oil, of fvvhich'the follovvingis aY full and exact description. y '.f Y In using the general iplanof cut off patv ent-ed by HoratioAllen in 1841, I propose to introduce a' inode of`adjnsting the slides, (that is of changing their position in relation to the Openings Which they are respecr tively to'close), which is herein described. This mode is y'represented inthe drawings `annexed to which reference is made. l Cand C are the cuto' slides, carried by independent rods R- and'R; one ofthe `rods may pass throughthe other, (as represented p in drawing) or `thetvvorods may come out of w "the steam chamber separately, each having its i necessary stuifing boX.'-' VThe rods It and It i arejconnected lby thelinks Z andZ to the `short arms or levers m and n. The arms m and n and theleverZLj are all united in l the relative position representedy in the drawing, to a common shaft S, so that they `i? must all move together with or on that shaft as a. center. The shaft S has its center in the lever A, Whichlever has itsk centerV- on a fixed pin l?. The lever A hasla -retipi-coating motion Vcoincident with that of the piston, but only thatV range of .motion at" the center ofthe shaft S that is required j-` for the cut H slides The lever A may derive this motion, either directly from the cross head (as represented in the drawing) l or. from an eccentricl on the crank shaft. `The end D ofthe lever L hangs on the rod E, the upper end of which has its center `in the end of the arm'F'. By means of the handle H therefore, the end of the lever L can be raised or depressed, or When the han-4 l die H is fastened in any position, the end l 'of the lever L cannot be raised or depressed although it mayhave a longitudinal motion. `It'vvill be seenthatas the end D can have no vertical motion as long as the handle is Vat that point. a similar effect will be produced at the vother Vfixed in one position, consequently the move- STATES oraison.

Specification of Letters Patent No. @028, dated May 1, 1845.

ments of the ends of the levers m and n must be alike and must be parallel with that of their common center.

As the parts are arranged in the drawing,

the piston is at the commencement of theVV Y stroke, and the cut off slides are supposed` to havea motion twice that of the distance from p the forward edge ofthe slide C, to g the far side of the opening O; consequently at half stroke the edge p will arrive at g and thus cut off the supply of steam v Y On the return of the stroke opening. If now the handle H be moved in either be Vdrawn together or separated, and consequently the steam will be cutoff at an earlier or later proportion of the stroke. In the place of the arms m and n there could be substituted a pinion Working into The combination herein described of the three leversV L, m and n having a common centerin the lever A, with the rod E, and

the slides C and C as a means of adjusting the'slideswhile the engine is in motion and the lever A is Working the slide by a reciproeating motion, or any combination substan- ,either direction the slides C and C Will tially the same, but I do not claim the Vcombination of, or the right to use the combination of adjustable slides and fixed seats with openings for eacheend of the cylinder as herein referred to and set forth in Letters Patent granted to Horatio Allen in August, 184:1.,

In testimony whereof I, the said THoMAs ROGERS, hereto subscribe my name in the presence of the Witnesses Whose naines are `hereto subscribed on the 15th day'of April,

THOMAS ROGERS. Signed in our presence:

J. M. HALL,

I. II. Voonmins. 

